Exhaust Pipe - Leak at the Mounting Flange

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Bulletin No. T-90-22
File in Group 6A
Number 110
Corp. Ref. NO. 916602
Date Nov. 1989

Figure 1 - Counterbored Shoulder:

SUBJECT: EXHAUST MANIFOLD FLANGE LEAKS

MODELS AFFECTED: 1989-1990 DE VILLES AND FLEETWOODS


Some 1989 and early production 1990 DeVille and Fleetwood models may experience a slight exhaust leak at the exhaust pipe mounting flange of the right-hand (rear side) exhaust manifold. Some exhaust manifolds may have been produced without the counterbored shoulder shown in Figure 1. The purpose of this shoulder is to position the metal sleeve, thus keeping the exhaust pipe seal aligned with the manifold.

To repair this condition a second design one-piece exhaust pipe seal has been released which captures the sleeve and seal together. The one-piece exhaust seal is available by ordering P/N 3523071 and supersedes the previous two-piece design. Parts are currently available from GMSPO.


WARRANTY INFORMATION VEHICLE SERIES
Operation
Operation Description Number C D E J K V

Seal, Front Exhaust Pipe - Replace L2090 .3


Part Group: 3.611
Policy: E